28757685 has 16 divisors (see below), whose sum is σ = 50195520. Its totient is φ = 13943040.

The previous prime is 28757681. The next prime is 28757699. The reversal of 28757685 is 58675782.

It is not a de Polignac number, because 28757685 - 2² = 28757681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28757681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86980 + ... + 87309.

It is an arithmetic number, because the mean of its divisors is an integer number (3137220).

Almost surely, 2^28757685 is an apocalyptic number.

It is an amenable number.

28757685 is a deficient number, since it is larger than the sum of its proper divisors (21437835).

28757685 is a wasteful number, since it uses less digits than its factorization.

28757685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174308.

The product of its digits is 940800, while the sum is 48.

The square root of 28757685 is about 5362.6192294438. The cubic root of 28757685 is about 306.3735772275.

It can be divided in two parts, 287576 and 85, that added together give a triangular number (287661 = T₇₅₈).

The spelling of 28757685 in words is "twenty-eight million, seven hundred fifty-seven thousand, six hundred eighty-five".